﻿using YAF.Lucene.Net.QueryParsers.Flexible.Core;
using YAF.Lucene.Net.QueryParsers.Flexible.Core.Builders;
using YAF.Lucene.Net.QueryParsers.Flexible.Core.Messages;
using YAF.Lucene.Net.QueryParsers.Flexible.Core.Nodes;
using YAF.Lucene.Net.QueryParsers.Flexible.Messages;
using YAF.Lucene.Net.Search;
using System.Collections.Generic;

namespace YAF.Lucene.Net.QueryParsers.Flexible.Standard.Builders
{
    /*
     * Licensed to the Apache Software Foundation (ASF) under one or more
     * contributor license agreements.  See the NOTICE file distributed with
     * this work for additional information regarding copyright ownership.
     * The ASF licenses this file to You under the Apache License, Version 2.0
     * (the "License"); you may not use this file except in compliance with
     * the License.  You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    /// <summary>
    /// Builds a <see cref="BooleanQuery"/> of SHOULD clauses, possibly with
    /// some minimum number to match.
    /// </summary>
    public class AnyQueryNodeBuilder : IStandardQueryBuilder
    {
        public AnyQueryNodeBuilder()
        {
            // empty constructor
        }

        public virtual Query Build(IQueryNode queryNode)
        {
            AnyQueryNode andNode = (AnyQueryNode)queryNode;

            BooleanQuery bQuery = new BooleanQuery();
            IList<IQueryNode> children = andNode.GetChildren();

            if (children != null)
            {
                foreach (IQueryNode child in children)
                {
                    object obj = child.GetTag(QueryTreeBuilder.QUERY_TREE_BUILDER_TAGID);

                    if (obj != null)
                    {
                        Query query = (Query)obj;

                        try
                        {
                            bQuery.Add(query, Occur.SHOULD);
                        }
                        catch (BooleanQuery.TooManyClausesException ex)
                        {
                            throw new QueryNodeException(new Message(
                                /*
                                 * IQQQ.Q0028E_TOO_MANY_BOOLEAN_CLAUSES,
                                 * BooleanQuery.getMaxClauseCount()
                                 */QueryParserMessages.EMPTY_MESSAGE), ex);
                        }
                    }
                }
            }

            bQuery.MinimumNumberShouldMatch = andNode.MinimumMatchingElements;

            return bQuery;
        }
    }
}
